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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc40ea0d6b5d86d1fe6f351a0c2f8333d008771799c315750f5901bc64f314c8' 
  AND token = 'QbOCSBTa6BLziFmD++EmoHs9fdiniVMi1fe5qIiaaxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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