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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a28e59c1795f490b13e40314ccbb92e6b5223491e29e62d03c76e38d9222eb9' 
  AND token = 'V813bPnyQNjebquMQJijJBzmEEBBAxbEc6+JBGo/4LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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