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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6cdc3dc8e23d3cc2becc1c4a058c37062c4bdb33f14b88b0954d9a9fc47cdf' 
  AND token = 'os3lwZsoJHDsTVBReCpwnr0SXAqcIZqhjbGsnv9AVuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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