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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '163340c88918577fd6f5968173bd7ad7e8d4183ed86b5d363855b64bc912a80a' 
  AND token = 'DJyZWia+RjHr3T0BjCohvKfndUM1WrFogkQjO7H1ZC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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