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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d15300dd8ed88f586180427b48b4634c9221854f6dae00b9de06dd082960e7' 
  AND token = '+7EVnTAf1T1AsNp/TPE9CCyy9cMOMRaXWNlNFemMA/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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