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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f8c02d0889031ffb1c743575106207756a696123172341aa8ab65c82e044ba' 
  AND token = 'XNiw0FMbsvtX7PwTVSurvKPiVRxarzJEpP7QplZ6vSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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