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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005095b9dd419bf922c337da3a450f2ff127c44878ce2200adf264ad7a69c90c' 
  AND token = 'VK6ZFSaJnf8u43gkc+y/9qgzDtR0qEbIVLtBBDHiX5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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