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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71e2c837b70a3cd632fd1ec237386082934c31ed98c1c456c25522bb57541ae' 
  AND token = 'QOzU5OgaCHqSNzzdqOiti6qYiCNLRFnws2LpYYRFKbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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