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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d341168366e3b20f0501e17fc809c2607413311ca8963dc6bc7e2ea07428f3' 
  AND token = '2wkjFWH8BFy2E+9BF+hI6sbPiV8s1OZQE2mpY2Vj1tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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