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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fe5a2e138af70f021a376afdc5859b492b0a052b6667a6ad24b5f8f4283177' 
  AND token = '/ikMoycJyqfzft2Ox5vKGQnma9YxPa+pNG/lnLXF2+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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