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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f48034536ced7dc19374bb785473a69878e51e277d4b2d542e9293c41fbdf1' 
  AND token = '0h6Jcr3AEf0uFf1Y6BTUmGTFraX2cG3G2M6zEs/H6yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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