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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e0155412cfc71b75379ae8307f52ad2e3d066912d7fa701cb8d04e1b8876e6' 
  AND token = '1apIXpkLQpkKHh0KCJqT1c3UtVeMEHZJnRFFQBjuHu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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