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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192b4ca82a808fe1c9be81b9a9e6d20421812d87e66e999d2cbd2533ea56d729' 
  AND token = 'DFusuTIMFzpFJ8SUqcAtKEMfQfj8qHrrjCn5XEORLuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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