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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f072d013712b9ddd0e017b8fae3c2a7e51b796f3324f0f2d7df1f5fda74521b5' 
  AND token = 'O8ITgY4okGdtMethgMsxuX+T6NOilT9hs0GyEmEjdGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}