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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e12f59e2201e7cbdf152aeddf0bee1dbf776c8149a738a884166aaad0516ba' 
  AND token = 'qqEKCUx7Z5GI7Im/EVvYkNz1hkkvl3+HvesfcauskCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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