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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8034e62e50515a2d1b9f8bcefb43a93763d3a08d8612c4db1af56f71097c206d' 
  AND token = 'rzNzZJXqRNu9VRYpF6VWAESczEugsAIFcxTgDvACa1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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