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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9650aaaa7eb43f9d78c3db304ce002dd42fc33e4b7e19572143bc4cf4994d584' 
  AND token = 'W5sYt6dAF6OZecLwjz8CB3CmaHSu1Dea4SQHATCqQgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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