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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914be0d69da6d5be6a44e266548344a0a08a203dd5e48969a27a987732106c3f' 
  AND token = 'VP7tOuv5cQAdiIlk5Npr6zY8ldXiv1do05KJWMAcM6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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