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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f1c04b7ea0e1743c3d9c141f881a9550cdbcac893fbe8235f021d63dcd6493' 
  AND token = '10KvszXgqteSTZfAcrQSjulZNiRj8605Ur5tkCAl6bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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