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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fb102e4acfec91fd385da52662be4d200b116c55b2a8873b8c8808640b96f9' 
  AND token = 'oudVRvWrwPG/h8Ftk8pg7zJu0p6v4nx98vfdN8lt82s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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