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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c26e9e7e8db5345416fa3e4c7f64d45ac93583e438ce5f2fe00554d8772fbe1' 
  AND token = '3EFzbdCr1AcjiV1RXu3Dok773DzhnGeRl9k73ySrvww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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