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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6db9717352ad5c9d5c672429c2ed8be5f107a225621f2fb2ffa16656780c770' 
  AND token = 'MscJNHgd5Q7cPvfrHGKBU8AjN50kXoWnniVDanO5594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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