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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be91a46ded84ccc6158e97b479c4fe1e3edda1b10b9f037efa7a1ca083b8f75' 
  AND token = 'ZdqedAcZtuU8HcelRIv/Vbjy4xIO9zNBnlT8M/gja6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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