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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5a479e7a5421dab968b1a799fa5288550d914ca940c2a16ab9af24e5ecf524' 
  AND token = '5itJDwBX2RKRv2O/v43tR0Quhb9oLyejMErNAbjFmFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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