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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f934209efdeb2c765e72c458c6565d473de9c3309a6cd2f1e7bc2e45806dd6ae' 
  AND token = 'JbsXW07vUOWX3PF+7/8AfWEkxXxv/Vvm8azxocXVTqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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