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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a68d3cd7939e341895d822333a67f1777ffbc3150159093ed88bd48c968dac' 
  AND token = 'd/zCVkxPzWUQtinL5zGggqpir15Bc5xuYI5c38WIp+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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