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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d77bdce38a19ca0e2e12ee74ea1b31fbec6d4cb90c987d68ae82eb4b7658ce' 
  AND token = 'uOmKKEMgoojDVZyqdpKgybCTmqLRI0aO61OMDKrOPCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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