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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a8f1c8e589e4a8173496252dd6b134aeae3c031adb1f9684001f8f25027aa0' 
  AND token = 'wxNhS2+mPCmnCM0Za0/UhAegp93xj6TZlm3HU7gyWFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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