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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a270902aa74d604ec36c9d1c1a261f6e76ccd93ecaab5a79bd6d0f59afd0c7e5' 
  AND token = 'YjpysKOdDhHzOLFA56vKhj85TPTz/kzaKUxsXUKTrK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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