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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58fe27e8b5ddf113f6b4063aca06e9b0b184cd382ac084c592834ce917a7494' 
  AND token = 'Gs2g6n898uDNKQvPxEU6M/tPQsyNRNvUE0grmbtmPTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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