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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25098cd51765102d48ac968b9c7868c5a70c3eeddcb46f9e2a23e837b158adb7' 
  AND token = 'rFh8lEFly43GL6J042G5s/sImFuNRJsjiniNrRu9Ok8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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