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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0e3bc0889b47adc4a003475827472df707817e1acb84d99e023bac72dcc6fa' 
  AND token = 'HL8wsI8zwR3JGUHqnHicLvcs9543Yuw7AaJmvNmWfSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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