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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6cc7af4e933b6e44e8a32a5c42cb191bf11290c11ceedea94deb15bc22f7a1' 
  AND token = 'D/qRAv1agKt04HifvraPbjxgmTlG0kLGS9OlIvPxHKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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