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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171f6cac2862ba12b5c357bbdd7fb589fe544be4d4517c4ae9ab6a1257a5ef55' 
  AND token = 'LiKKm9AKduguX77F/Q9PZO66RkcCORpgPIriltvHSi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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