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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41136d97a7e6b438aa08e5f00cf33df74c5356b0c4ad35705a9e22a842873203' 
  AND token = 'boVX6YpJqv2eCuEaDv8LyPRcu1Wu6Vp9voeUFA3xIWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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