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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8356a2cec6f19158aac7d6bd20e2f14fcf0e638523d9f0291d9ad3d91c02a46c' 
  AND token = '63AsNJdH1x0vDGikyQo9/63SZ9CUCJUFayj+2+eyEXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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