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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68ebb59370eacb8c98a099e614c07cb8cc3a43f1c7c4d23981a2a795cb2cc21' 
  AND token = 'oxQ7DARbBFK7EfW5rBjQTYXx6s0eCd9gmqEefq8aHbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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