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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6090d30d6625d98ac518bcbc911d35104d5a536ea2a8e1efdef8d1e03c24a7a' 
  AND token = 'lpFEwToZcXFuHqYC4IvE1EHkWoTT3MuHnuijZ3RVmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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