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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c12428cabf6b416318ccb0734c6cdf434fb29678d855c999f42487b6e4f596f' 
  AND token = '7abMgiFo/UDIHaiJg2QzTYLFaBTrLyRQ7iymIVkWFBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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