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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3593f9ef3bbe7cfecabe7500cf29ef0839c617b4a46e2a4c6c5211c6381527c5' 
  AND token = '3rlQ0BGOWB1poQenC7UpmFLHtCQhF8AZNCL9V4C+CV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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