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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbcb68d3d98bf4481e544d6d7735e66307e96ddb40bfa5618d02f6f60adee51' 
  AND token = '4bM6k+MsslD/If8v/AJCFQTfHObuEdCv0v3Q+dvk0nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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