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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaeaeb437d7ac0d45a9a77f53e857a242da99e35b8f2d1b5093be902ad33fb4' 
  AND token = '4ydiPn3Q/A7lFe6v2MnF4tycbwy1CWcYqjfJW8jhNSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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