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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6690f84f29f4ac1a6fef23772dcda7ad0ccbaa344031e5945316a4d88bfbdb' 
  AND token = 'UNzPd5rxi86cLp33e0ggBRZQXwFpYOYYdrZLoMDCBU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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