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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430752f4b01ff968f9f00ff7e4041b335f10bbe9dc1b203f2d6a0629a164e4b6' 
  AND token = 'vK0qgnPHCl75kczbxtib2sqOiw6USXlTgUqWfPP0WV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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