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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67884877b63fcc340f36d056afb610fc4364eeed6b5f3c3517bc1d38c5e58154' 
  AND token = 'ROJYm7Lt6dCgqBFxQ6Uk+AndLHg5tUQro4BD10yDBx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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