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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5318ccc2e85eb759761874b9356930dcc9d1e50d0b529cecf1f0822dcdec9dc' 
  AND token = '9q/98GjuQRjvDVhbMUvEuqydOddiSAoSfvxIhM4pwyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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