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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8583f7dba9642dfe61495051f5a628973d66def9f3a0a20235b646e2406565' 
  AND token = 'kfH4MQDoew19wFqZUWvlNwqLIt7lpoov6blurlLeIcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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