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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd22b3f3652e6412afed28bcfec6fecb4883c65342561ccfb8c99ea9e9f08ca70' 
  AND token = 'qTpqtbRWwPehzPiDhylSiNz0GBdf4M03NUjI4J2MQIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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