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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9700f6300b81add1027fb05334e5c3b4268b4ff3c63235c68a605c6c27104867' 
  AND token = '3k5TT/bfLky/un0fpiyD06LycpXTspAl0ZWzIZ+8lGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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