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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93c054ca718485fc28cde9d78b654c1607934047b3fd91fa2d8e932a3e0c517' 
  AND token = 'Oj2kwQLHfl1d60y/Ve+XW5ZJJFyYPVrAOczsDD2I7yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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