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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25fe0055f98c3a0103f1d9c32e46613e7802d2d711a7e44d545785e4695e5fb5' 
  AND token = '1OPgIwXAoSgEWrk6rwafAV8gTm9orPovyK4gp8g1h5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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