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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e3bc8361d413a42c578da8abe3d778456bd91741b46a39c8794fe3c2b11e3d' 
  AND token = '1F8YvmLLCL8NnBtO0vST7l5mQOD6pOqKdvV80gmzWtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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