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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93728d55ed1f60a9550170b1b41bc15175242023c42f65fd45a02b618871e90' 
  AND token = 'eK2vgJu8zeHjD/adhP7/3O1MfeTaeIOyQ05/OSl1RmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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